Problem executing a program

Hi,
I have been trying to test very easy programs with Erlang.
I have made a standard installation of Erlang (configure
--prefix=/home/myhome; make; make install) after reading the README
When I try to execute this program:
-module(hello).
-export([start/1]).
-include_lib("kernel/include/file.hrl").
%%**HERE**
start(Args) ->
io:format("Hello world~nArgs=~p~n", [Args]),
erlang:halt().
$ ecc test.erl
works just well.
But when I add in %%**HERE** the line:
-include_lib("megaco/include/megaco.hrl").
it just do not work anymore:
$ecc test.erl
./test.erl:6: can't find include lib "megaco/include/megaco.hrl"
Actually I obtain the same message while trying to compile
~/lib/erlang/lib/megaco-2.1.3/examples/simple/megaco_simple_mgc.erl
$ecc megaco_simple_mgc.erl
./megaco_simple_mgc.erl:52: can't find include lib
"megaco/include/megaco.hrl"
./megaco_simple_mgc.erl:53: can't find include lib
"megaco/include/megaco_message_v1.hrl"
./megaco_simple_mgc.erl:120: undefined macro 'megaco_ip_port_text'
./megaco_simple_mgc.erl:134: record megaco_receive_handle undefined
./megaco_simple_mgc.erl:283: undefined macro 'megaco_not_implemented'
./megaco_simple_mgc.erl:312: undefined macro 'megaco_root_termination_id'
./megaco_simple_mgc.erl:334: undefined macro 'megaco_not_implemented'
./megaco_simple_mgc.erl:76: function do_start/1 undefined
./megaco_simple_mgc.erl:39: function handle_trans_long_request/3 undefined
./megaco_simple_mgc.erl:39: function handle_trans_request/3 undefined
Where come this error from? I could not find any reference while googling...
Any link, hint would be most wellcome.
Thanks!
G